<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <link href="css/css_10_浮动.css" rel="stylesheet">
</head>
<body>

<div class="sub-nav">
    <div class="sub-left"></div>
    <div class="sub-middle"></div>
    <div class="sub-right"></div>
</div>


</body>
</html>